Yes. Have more than one book at hand. Apostol's books seem to be still available, albeit published in India (which means low-grade ink and paper). Still, each of the two volumes is under $20. Also get the Schaum Series "Beginning Calculus." You already have Lang. I also like Banner's "The Calculus Lifesaver." For multivariable you will need some additional books (other than Apostol, that is), as well as some background in linear algebra.Thank you - very helpful.
Current level: Beginner. I understand the basic concepts of differentiation, the rules of derivatives etc. But no prior knowledge of integral calculus or multivariable calculus.
I take it your advice is still valid for such knowledge level?